I am in the middle of trying to build an interface for my flight sim (fs2004). Just learning the basic about talking to flight sim via a dll i made in the modules folder, compiled with visual c++ 2008 express, all compiles good. It crashes when i try to read a simple variable. If anyone can steer in the right direction as to why it crashes that would be great. i have been reading for hours and try many different ways of doing this basic task (reading pressure millibars). Here is the code: Basically after i call lookup_var it crashes. #include <windows.h> #include "gauges.h" /* This is the module's import table. */ \ GAUGESIMPORT ImportTable = \ { \ { 0x00000000, (PPANELS)NULL }, \ { 0x00000000, NULL } \ }; \ \ \ void FSAPI module_init(void) { } void FSAPI module_deinit(void) {} /* This is the module's export table. */ \ GAUGESLINKAGE Linkage = \ { \ 0x00000000, \ module_init, \ module_deinit, \ 0, \ 0, \ 0x900, {0} }; // The standard window procedure used by the flight simulator WNDPROC oldWndProc; // Flight simulator main window handle HWND hFSimWindow; #define MENU_ENTRY "My Mo&dule" #define ID_MY_MENUITEM 40001 #define INIT_MY_MENUITEM 40002 /** * Main window procedure that is called by the flight simulator to process * incoming window messages. */ FLOAT64 AmbientPressMB = 0 ; MODULE_VAR AMBIENT_PRES_MBARvar = {AMBIENT_PRES_MBAR}; LRESULT CALLBACK FSimWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { char buffer[20]; switch (uMsg) { case WM_NCPAINT: { HMENU hMenu, hMyMenu; hMenu = GetMenu(hwnd); if (hMenu != NULL) { int i; // Look for our menu entry in the main menu. for (i = 0; i < GetMenuItemCount(hMenu); i++) { char buf[128]; GetMenuString(hMenu, i, buf, 128, MF_BYPOSITION); if (strcmp(buf, MENU_ENTRY) == 0) { // It is already here, we do not need to add it again break; } } if (i < GetMenuItemCount(hMenu)) { // It is already here, we do not need to add it again break; } /* Create new menu. NOTE: It seems that this will be * reached more times, so we cannot save the handle, because * in such case it could be destroyed and we will not have * any access to it in the simulator. */ hMyMenu = CreateMenu(); AppendMenu(hMyMenu, MF_STRING | MF_ENABLED, ID_MY_MENUITEM, "My &First Menu Entry"); AppendMenu(hMyMenu, MF_STRING | MF_ENABLED, INIT_MY_MENUITEM, "See"); // add the created menu to the main menu AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT_PTR)hMyMenu, MENU_ENTRY); } } break; case WM_COMMAND: if (LOWORD(wParam) == INIT_MY_MENUITEM) { } if (LOWORD(wParam) == ID_MY_MENUITEM) { // THIS SEEMS TO CRASH IT lookup_var(&AMBIENT_PRES_MBARvar); AmbientPressMB = AMBIENT_PRES_MBARvar.var_value.n; //sprintf("Value = %d",mad_altitude_set.var_value.n); MessageBox(hwnd, "hello", "HURA", MB_OK | MB_ICONEXCLAMATION); return 0; } break; case PANEL_SERVICE_PRE_UPDATE: break; } // Call the original window procedure to handle all other messages return CallWindowProc(oldWndProc, hwnd, uMsg, wParam, lParam); } /** * Entry point of the DLL. */ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpvReserved) { switch (fdwReason) { case DLL_PROCESS_ATTACH: hFSimWindow = FindWindow("FS98MAIN", NULL); oldWndProc = (WNDPROC)SetWindowLong(hFSimWindow, GWL_WNDPROC, (LONG)FSimWindowProc); break; } return TRUE; } Thanks

Hello,Can be interesting for some there ..http://forums1.avsim.net/index.php?showforum=204Regards.Gus.

You may get more luck posting this on the FSDeveloper forum here: http://www.fsdeveloper.com/Dave

You may get more luck posting this on the FSDeveloper forum here: http://www.fsdeveloper.com/Dave

thanks